New restrain builtin function?

[Greg Ewing (using news.cis.dfn.de)]

Robert Brewer wrote:
> Second, there's the question of "what is an iterable"? Some solutions:

But by far the best solution, IMO, is to re-design the API
so that you don't have to ask the question at all!

-- 
Greg Ewing, Computer Science Dept,
University of Canterbury,	
Christchurch, New Zealand
http://www.cosc.canterbury.ac.nz/~greg